用于ElasticSearch多字段搜索的Java API

import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.index.query.MultiMatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;

public class ElasticSearchMultiFieldSearchExample {
    public static void main(String[] args) {
        // 创建Elasticsearch客户端连接
        RestHighLevelClient client = createElasticsearchClient();

        // 构建搜索请求
        SearchRequest searchRequest = new SearchRequest("index_name");
        searchRequest.types("document_type");

        // 构建查询条件
        MultiMatchQueryBuilder queryBuilder = QueryBuilders.multiMatchQuery("search_text", "field1", "field2")
                .fuzziness(Fuzziness.AUTO)
                .prefixLength(3);

        // 设置查询条件到搜索请求
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(queryBuilder);
        searchRequest.source(sourceBuilder);

        try {
            // 发送搜索请求并获取搜索结果
            SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

            // 处理搜索结果
            // ...

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭Elasticsearch客户端连接
            closeElasticsearchClient(client);
        }
    }

    private static RestHighLevelClient createElasticsearchClient() {
        // 创建Elasticsearch客户端连接
        // ...
        return client;
    }

    private static void closeElasticsearchClient(RestHighLevelClient client) {
        // 关闭Elasticsearch客户端连接
        // ...
    }
}